【摘要】 目的:研究牙尖斜度的三维测量方法,从牙体解剖方面探讨磨牙隐裂病因。方法:隐裂组、对照组磨牙模型经螺旋CT扫描后,数据图像以DICOM格式直接输入Efilm1.8.3软件进行牙尖斜度及牙尖斜面夹角三维重建测量。结果:隐裂组的近中颊、舌尖牙尖斜度均数都大于对照组,前者相差9.02°,后者相差9.29°;牙尖斜面夹角均数小于对照组,相差17.34°。成组t检验两组的近中颊、舌尖牙尖斜度,牙尖斜面夹角均有显著性差异(P<0.01)。结论:牙尖斜度的大小是磨牙隐裂重要病因之一,牙尖斜度越大,牙尖斜面夹角越小,隐裂发生的可能性越大。更多还原

【Abstract】 Objective:To study a 3D-measurement for cuspal inclination and evaluate the anatomical etiology of the cracked molars.Method:A case-control study was conducted (14 cracked-molar dies as a case group and 22 normal-molar dies as a control group). Images were obtained by spiral CT scan and immediately imported into Efilm1.8.3 software measure cuspal inclination and cuapal incline angle after 3D-reconstruction.Result:The mean of mediobuccal cuspal inclination angles in cases was bigger than that in controls , so was the mean of mediolingual ones . The former’s difference was 9.02and the latter’s was 9.29. Both showed statistically significant difference(α=0.05,P<0.01)by the independent test. While the mean of cuspal incline angle in cases was smaller than that in controls, the difference was (17.34)which also showed statistical significance.Conclusion:Cuspal inclination was one of the important anatomical factors in the etiology of CTS in molars .The bigger the inclination and the smaller cuspal incline angle ,the more likely the presence of CTS.更多还原